But by the end, the police department became a collaborator and author of this study... because the results in fact showed a 25% drop in violent crime in Washington, D. C... which we could predict on the basis of 48 previous studies... that had already been done on a smaller scale.
hauriadecaure migmetredeneu." Peró,aIfínaI,IapoIicia vacoI·IacorarenI'estudi, perquèI'índex dedeIictes vioIentss'haviareduïítun25%%%